Hypodermic-syringe needle and base



F. L. PL-ATT. G. N. HEIN AND R. R. IMPEY. HYPODERMIC SYRINGE NEEDLE AND BASE.

- APPLICATION HLED MAY 6. 19:9.

1,318,586. I Patented Oct. 14,1919.

A TTOR NE YS UNITED STATES PATENT OFFICE.

FRANK L. PLATT, GEORGE 1v. HEIN, AND ROBERT R. iMPEY, OE SAN FRANCISCO,

cALIEORNIA.

HYPODERMIC-SYRIN'GE NEEDLE AND BASE.

Specification of Letters Patent.

Patented Oct. 14, 1919.

Application filed MayG, 1919. Serial No. 295,072.

To all whom it may concern:

Be it known that we, FRANK L. PLATT, GEORGE N. HEIN, and ROBERT E. IMPEY, citizens of the United States, residing at the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Hypodermic- Syringe Needles and Bases, of which the following is a specification.

The present invention relates to improvements in needles and needle mountings for hypodermic syringes.

The principal objects of our present invention are to provide a hypodermic needle which after each use is capable of being readily removed from its associated tip for the sterilizing thereof, such construction enabling the useof needles of various lengths with the same or various tips; toprovide a construction wherein the needle base is, when assembled, retained in tight frictional contact through a metallic joint connection, insuring a fluid tight joint, and at the same time enabling the mounting to be thoroughly boiled for the sterilizing thereof, without injuring the packing joint; one wherein the needle base is provided with a depression for receiving an outstanding nipple on the mounting, which insures the directing of the hypodermic charge into the needle bore.

l Vith the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departing from the.

* spirit or sacrificing any of the advantages of the invention.

To more fully comprehend the invention, reference is directed to the accompanying drawings, wherein Figure 1 is a view in ide elevation of a portion of a hypodermic syringe barrel illustrating the preferred embodiment of our invention applied thereto.

Fig. 2 is a longitudinal central sectional view of our invention illustrating the preferred joint connection.

Referring more particularly to the drawings, wherein like characters of reference designate corresponding parts, 1 indicates a syringe barrel to the threaded discharge end of which is detachably secured the coupling or applicator 2, to which is, in turn, detachably secured the needle tip 3 within which is removably positioned the needle 4:, although it will be readily apparent that the end of the syringe might, in some cases, 'be fash ioned to receive the needle and tip, thus dispensing with the applicator in certain cases. The applicator is formed at one end of the tubular channel 5 extending centrally therethrough with a threaded cup or depression 6 for the reception'of the outer threaded end 7 of the syringe barrel 1. The base of the depression 6 is provided at a point slightly removed from the side wall of said base with an annular packing receiving groove 8 surrounding the inlet end of the channel 5 and providing an outstanding portion 9 surrounding the inlet end of said channel 5.

Within the groove 8 is positioned the metallic packing 10, preferably of tin, and the outer surface thereof lies preferably below the outer end of the outstanding portion 9. With this packing is adapted to contact the terminal discharge end of the syringe barrel when the applicator is attached thereto.

The oppositeor outer end of the applicator isalso provided with a depression 11, the wall of which is threaded for a portion ofits depth and within the base of said depression is the centrally disposed outwardly,

sion 11.

Receivable within the depression 11 and having threaded connection with the wall surface thereof, is the inner threaded end of the tip 3, said tip being preferably tapered toward its outer end and provided with a needle receiving bore 14 extending longitudinally through the center thereof. The inner end of the bore 14 is provided with a cylindrical recess 1 for the reception of a cylindrical base 15 which mounts the needle 4, said base being of a length to project slightly beyond the inner end of the tip so that its inner end will rest on the metallic packing 13 with the end of the nipple 12 extending into the enlarged stepped seat 16 in the cylindrical base 15, during such time as the tip is mounted in the applicator. The inner end of the needle at abuts against a shoulder 4; surrounding the passage in the base 15 which prevents the driving of the needle through the base when the point thereof is driven into the bone tissue.

In our present construction it will be apparent that the needle 4 and base 15 are readily removable from the tip on the separating of the tip from its associated mounting, and it will be observed that the needle is not retained within the tip through any type of frictional joint but the fluid tight connection is made solely between the inner surface of the base 15 mounting the needle and the metallic packing 13 surrounding the nipple 12. It will also be apparent that all packings are metallic and preferably of noncorrosive material which enables the respective elements to be easily and quickly sterilized after use without injuring the packings.

As illustrated in dotted linesFig. 2, it is apparent that the tips 3 may be of various lengths to correspond to needles of vari ous lengths so as to support the needle adjacent to its end and in practice it is desirable to supply various length tips for use with various lengths and diameters of needles.

Having thus described our invention, what we claim as new and desire to protect by Letters Patent is 1. In a hypodermic syringe, a tubular needle tip provided with a needle receiving bore extending therethrough, said tip provided in its base with a cylindrical needle base receiving recess surrounding the inner end of said needle receiving bore, a hypodermic needle for reception within said bore and provided with a centrally channeled base for reception within said receiving recess, said base being of a length to project beyond the inner end of said tip, a channeled member provided with a recess for receiving the inner end of said tip and needle base and to which said tip is detachably secured, and a metallic packing within said recess and into contact with which said needle base is forced to provide a fluid tight joint between the member and needle base.

2. In a hypodermic syringe, a tubular needle tip provided with a needle receiving bore extending therethrough, a hypodermic needle for reception within said bore and provided at its rear end with an enlarged base for contacting with the inner end of said tip, a channeled member provided with a nipple and to which said tip is detachably secured through a threaded connection, said needle base provided with a recess for receiving said nipple end, and a metallic washer carried by said member and sur rounding said nipple below the end thereof and with which the portion of said needle base surrounding said recess therein contacts to provide a fluid tight joint between said parts.

3. In combination with a hypodermic syringe including a tubular tip provided at one end with an enlarged recess surrounding the tubular portion thereof, a hypodermic needle for removable reception therein, a tubular base mounting said needle and provided with a flange against which the inner end of the needle abuts, said base adapted for reception within said enlarged recess, and means for uniting said syringe and tip.

4. A. hypodermic needle including a tubular needle a tubular base within which the inner end of said needle is received, said base being provided with a shoulder against which the inner end of said needle abuts, whereby the forcing of the needle through the tubular base is precluded on pressure being applied longitudinally thereto.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

FRANK L. PLATT.

GEORGE N. I-IEIN.

ROBT. R. IMPEY.

Witnesses HARRY A. TOTTEN, D. B. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

